package com.nio.netty.codec2;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufEncoder;

public class NettyClient {
    public static void main(String[] args) throws InterruptedException {
        /*客户端需要一个事件循环组*/
        NioEventLoopGroup group = new NioEventLoopGroup();
        try {
            /*创建一个客户端启动对象*/
            /*客户端使用的不是ServerBootstrap 而是Bootstrap*/
            Bootstrap bootstrap = new Bootstrap();
            /*设置相关参数*/
            bootstrap.group(group) /*设置线程组*/
                    .channel(NioSocketChannel.class)    /*设置客户端通道的实现类*/
                    .handler(new ChannelInitializer<SocketChannel>() {
                        protected void initChannel(SocketChannel ch) throws Exception {
                                /*在pipeline中加入ProtoBufEncoder*/
                            ChannelPipeline pipeline = ch.pipeline();
                            pipeline.addLast("encoder",new ProtobufEncoder());

                            pipeline.addLast(new NettyClientHandler());/*加入自己的处理器*/
                        }
                    });
            System.out.println("客户端 ok....");
            /*启动客户端去连接服务器端*/
            /*关于 ChannelFuture 要分析，涉及到Netty的异步模型*/
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 6668).sync();
            /*给关闭通道进行监听*/
            channelFuture.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }
}
